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Abstract

The quality of insulation on a conductor can be determined non-destructively by measuring current flow from the insulated conductor to a bare electrode while both are immersed in an ionic solution.

Country

United States

Language

English (United States)

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Non-destructive Test for Wire Insulation

The quality of insulation on a conductor can be determined non-destructively
by measuring current flow from the insulated conductor to a bare electrode while
both are immersed in an ionic solution.

In the figure, insulated conductor 1 under test is immersed in an ionic solution
2, and is connected at one end by a scanning device 3 to the negative terminal of
d.c. power supply 4. A bare conductive electrode 5 is also immersed in solution
2 out of contact with conductor 1 and connected through sense resistor Rs of
known value to the positive terminal of power supply 4. Voltmeter 6 measures the
potential difference across resistor Rs. Insulation resistance Rx is computed as:
Rx = Rs[(Et/Es)-1] where Et is the power supply voltage and Es is the voltage
drop across Rs.

In practice, solution 2 is 0.1 molar potassium chloride or sodium chloride or
equivalent preferably maintained at approximately 50 degrees C, the power
supply is 10 vdc and the s resistor Rs is one megohm. Scanning device 3 is
shown as attached to conductor 1 to enable successive measurements of
multiple conductors when conductor 1 is a cable.